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參數(shù)資料
| 型號： | LT3782IFE#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4 A SWITCHING CONTROLLER, 533 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-28 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 223K |
| 代理商： | LT3782IFE#TR |
LT3782
15
3782fg
2. Power MOSFET switching and conduction losses:
PFET =
IO(MAX)
2
1– DMAX
2
RDS(ON) DMAX T
+ k VO
2
IO(MAX)
2
1– DMAX
CRSS f
3. The I2R losses in the sense resistor can be calculated
almost by inspection.
PR(SENSE) =
IO(MAX)
2
1– DMAX
2
R DMAX
4. The losses in the inductor are simply the DC input cur-
rent squared times the winding resistance. Expressing
this loss as a function of the output current yields:
PR(WINDING) =
IO(MAX)
2
1– DMAX
2
RW
5. Losses in the boost diode. The power dissipation in the
boost diode is:
P
DIODE =
I
O(MAX)
2
V
D
The boost diode can be a major source of power loss
in a boost converter. For 13.2V input, 42V output at 3A,
a Schottky diode with a 0.4V forward voltage would
dissipate 600mW, which represents about 1% of the
input power. Diode losses can become signicant at
low output voltages where the forward voltage is a
signicant percentage of the output voltage.
6. Other losses, including CIN and CO ESR dissipation and
inductor core losses, generally account for less than
2% of the total losses.
PCB Layout Considerations
To achieve best performance from an LT3782 circuit, the
PC board layout must be carefully done. For lower power
applications, a two-layer PC board is sufcient. However,
at higher power levels, a multiplayer PC board is recom-
mended. Using a solid ground plane under the circuit is
the easiest way to ensure that switching noise does not
affect the operation.
In order to help dissipate the power from MOSFETs and
diodes, keep the ground plane on the layers closest to the
layers where power components are mounted. Use power
planes for MOSFETs and diodes in order to improve the
spreading of the heat from these components into the
PCB.
APPLICATIONS INFORMATION
相關PDF資料 |
PDF描述 |
|---|---|
| LT3782IFE | 4 A SWITCHING CONTROLLER, 533 kHz SWITCHING FREQ-MAX, PDSO28 |
| LT3837IFE#PBF | SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO16 |
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| LT3845AMPFE#TRPBF | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3845AIFE#TRPBF | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
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| LT3791EFE#PBF | 功能描述:IC LED DRVR CONTROL 38TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅動器 系列:True Color PWM™ 標準包裝:60 系列:- 恒定電流:- 恒定電壓:- 拓撲:線性（LDO），PWM，升壓（升壓） 輸出數(shù):8 內部驅動器:是 類型 - 主要:背光 類型 - 次要:RGB，白色 LED 頻率:500kHz ~ 1.5MHz 電源電壓:4.75 V ~ 26 V 輸出電壓:45V 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* 工作溫度:-40°C ~ 85°C |
| LT3791EFE#TRPBF | 功能描述:IC LED DRVR CONTROL 38TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅動器 系列:True Color PWM™ 標準包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓撲:開路漏極，PWM 輸出數(shù):4 內部驅動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應商設備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
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